JPH1113891A - Bearing seal device for water pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing seal device for a water pump improving reliability without markedly increasing a cost of manufacture. SOLUTION: A flinger 120 is placed in a condition of no contact relating to a third lip part 115c further with a large cylinder 120f extended along the third lip part 115c, by the large cylinder 120f, so as to shield the third lip part 115c from the outside. In this way, even when steam of cooling water and a water drop are sprayed in a bearing seal device 100, the large cylinder 120f of the flinger 120 prevents steam of cooling water and a water drop from being directly sprayed on the third lip part 115c, in this way, infiltration of cooling water into the inside of a bearing can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing seal device for a water pump, and more particularly to a water-cooled internal combustion engine.
The present invention relates to a bearing seal device that prevents water and water vapor from entering a bearing that supports a rotating shaft of a water pump that circulates cooling water, and that prevents grease and the like from flowing out of the bearing.

In a water-cooled internal combustion engine, a water pump is used to send cooling water heated in various parts of the internal combustion engine to a heat exchanger such as a radiator to radiate heat, and to circulate the cooled cooling water to various parts of the internal combustion engine again. Is provided.

FIG. 4 is an axial sectional view of such a water pump. In FIG. 4, a housing 1 is provided so as to rotatably support a rotating shaft 12 with respect to the housing 11.
A bearing 10 is arranged between the shaft 1 and the rotating shaft 12.
A pulley 13 driven by an internal combustion engine (not shown) via a belt is disposed at a left end of the rotating shaft 12, and an impeller 14 is disposed at a right end of the rotating shaft 12.

[0004] A case for pumping the cooling water to the outside by interaction with the rotating impeller 14 is arranged around the impeller 14, but is omitted in FIG. In the vicinity of the impeller 14, a mechanical seal 1 is provided between the rotating shaft 12 and the housing 11.
6 are arranged. On the other hand, a bearing seal device 400 is also arranged at the end of the bearing 10.

FIG. 5 shows a conventional bearing sealing device 4.
It is axial sectional drawing of 00. In FIG.
A seal member 15 is disposed at an end of the seal member 15. The sealing member 15 includes a metal core 15a, a sealing body 15b, and lip portions 15c, 15d, and 15e. The core metal 15 a has an inverted L-shaped cross section, and is attached to the outer ring 10 a of the bearing 10. The seal 15b is in close contact with the outer surface of the core 15a, and a third lip 15c extending in the radial direction from the seal 15b at an intermediate position of the core 15a is formed.

On the other hand, the cross section of the seal body 15b shown in FIG. 5 has a bifurcated shape, and a main lip portion 15e forming one of the two extends diagonally to the lower right and a sub lip portion 15d forming the other side. Extends obliquely to the lower left.

[0007] A stainless steel flinger 20 is disposed on the rotating shaft 12. The flinger 20 is composed of a small cylinder 20c that is tightly fitted to the rotating shaft 12, a large cylinder 20a that coaxially includes the small cylinder 20c, and a flange portion 20b that connects both cylinders in the radial direction.

[0008] The third lip 15c of the sealing member 15
The main lip portion 15e contacts the outer periphery of the small cylinder 20c, and the sub lip portion 15d contacts the outer peripheral surface of the rotary shaft 12 to achieve sealing. .

[0009]

By the way, returning to FIG. 4, the mechanical seal 16 seals the cooling water, but the sealing is not perfect, and the steam and water droplets of the cooling water are gradually removed from the seal 16. May leak out.

In such a case, in FIG. 5, steam and water droplets of the cooling water directly fall on the third lip portion 15c. However, if the amount of steam or water droplets of the cooling water that falls directly is large,
The third lip portion 15c may be deformed, whereby the cooling water may enter the inside of the bearing 10.

On the other hand, there is a thought that it is sufficient if the third lip portion 15c is immersed in steam or water droplets of the cooling water to further improve the sealing and waterproofing properties. However, this leads to excessive quality of the sealing member 15, and the like. This increases the manufacturing cost of the bearing seal device.

[0012] In view of the above problems, an object of the present invention is to provide a bearing seal device for a water pump with improved reliability without significantly increasing the manufacturing cost.

[0013]

In order to achieve the above object, a bearing seal device for a water pump according to the present invention has a lip portion attached to one of an outer ring and an inner ring of a bearing and extending toward the other. A bearing member comprising a sealing member having an annular member attached to the other ring and abutting on the lip portion of the sealing member all around. And an extending portion extending along the lip portion, and the lip portion is shielded from the outside by the extending portion.

[0014]

According to the bearing seal device for a water pump of the present invention, the annular member has an extending portion extending along the lip portion in a non-contact state with the lip portion,
Since the lip portion is shielded from the outside by the extension portion, even if the cooling water vapor or water droplets fall on such a bearing seal device, the extension portion of the annular member is It is possible to prevent steam or water droplets of the cooling water from directly falling on the lip portion, thereby preventing the cooling water from entering the inside of the bearing.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an axial sectional view of a bearing seal device 100 according to the first embodiment. In FIG. 1, the bearing 10 includes an outer ring 10a, a rotating shaft 12 forming an inner ring, a ball 10b sandwiched between the outer ring 10a and the rotating shaft 12, and a retainer 10c for holding the ball 10b.

A seal groove 10 formed at an end of the bearing 10
A seal member 115 is disposed in the space d. The seal member 115 includes a core bar 115a, a seal body 115b,
It comprises lip portions 115c, 115d and 115e. The core metal 115a has a shape such that the inner peripheral portion of the annular plate is shifted rightward in the figure. A seal body 115b is in close contact with the outer surface of the core bar 115a, and the outer edge thereof is attached to the seal groove 10d. A cylindrical third lip 115c is formed at an intermediate position of the core bar 115a so as to extend rightward in the drawing from the seal body 115b.

On the other hand, the cross section of the seal body 115b shown in FIG. 1 has a bifurcated shape, and a main lip portion 115e forming one of them extends diagonally to the lower right and a sub lip portion 115d forming the other side. Extends obliquely to the lower left.

On the rotary shaft 12, a flinger 120 made of stainless steel is arranged. FIG. 2 shows the flinger 12
FIG. The flinger 120 has a shape like a double flinger of the prior art (FIG. 5). More specifically, a small cylinder 120c closely fitted to the rotating shaft 12 and a conical portion 120a coaxially enclosing the small cylinder 120c
A first flange portion 120b radially connecting the small cylinder 120c and the conical portion 120a; a middle cylinder 120d connected to the conical portion 120b; a large cylinder 120f coaxially enclosing the middle cylinder 120d; And a second flange portion 120e connecting the large cylinder 120f in the radial direction. Such flinger 120 can be formed relatively easily by pressing a single disk.

Third lip 115c of seal member 115
Abuts on the outer periphery of the middle cylinder 120d of the flinger 120, the main lip portion 115e abuts on the outer periphery of the small cylinder 120c, and the sub lip portion 115d abuts on the outer peripheral surface of the rotary shaft 12, thereby achieving sealing respectively. ing.

Further, the large cylinder 120f of the flinger 120
Extends parallel to the third lip portion 115c of the seal member 115, and shields the third lip portion from the outside. A narrow space is formed between the end portion 120g of the large cylinder 120f, the seal body 115b, and the inner peripheral surface of the large cylinder 120f and the outer peripheral surface of the third lip, thereby forming a so-called labyrinth seal.

The bearing seal device 10 according to the present embodiment
The operation of 0 will be described below. Bearing sealing device 10
In the case where steam or water droplets of the cooling water scatter from the outside of 0, the cooling water is received on the outer surface of the flinger 120 so that the cooling water does not directly fall on the seal member 115. Thereby, the sealing member 115 (particularly, the third
The deformation and swelling of the lip portion 115c) can be prevented.

On the other hand, grease and the like sealed inside the bearing 10 are sealed by the sub lip portion 115d and the main lip portion 115e of the seal member 115, so that leakage to the outside is prevented.

In the present embodiment, the sealing member 11
5 adopts a so-called radial type in which the interference is not changed by the axial clearance of the bearing 10,
It is possible to stably prevent cooling water from entering. Furthermore,
Although the sealing performance of the cooling water is improved as described above with respect to the conventional technology, the sliding area of the sealing member does not increase because of the labyrinth shape, and therefore, the sliding performance is improved. The dynamic resistance is equivalent to the prior art.

FIG. 3 is an axial sectional view of a bearing seal device 200 according to the second embodiment. Note that the second embodiment will be described focusing on the differences from the first embodiment shown in FIG. 1, and the common parts will be assigned the same reference numerals and description thereof will be omitted.

The difference between the second embodiment shown in FIG. 3 and the first embodiment is the shape of the flinger 220. More specifically, the flinger 220 extends the fitting portion of the rotating shaft 12 with respect to the flinger of FIG. 1, that is, forms a long small cylinder 220c. Other configurations and operations are the same as those in the above-described embodiment, and thus description thereof will be omitted.

Although the present invention has been described with reference to the embodiments, it should be understood that the present invention should not be construed as being limited to the above embodiments, and that modifications and improvements can be made as appropriate. is there. For example, the flinger may be formed by press molding or by welding.

[0027]

According to the bearing sealing device for a water pump according to the present invention, the annular member has an extending portion extending along the lip portion in a state of not contacting the lip portion of the bearing sealing device. Since the lip portion is shielded from the outside by the extension portion, even if the cooling water vapor or water droplets fall on such a bearing sealing device, the extension portion of the annular member is provided. However, it is possible to prevent cooling water vapor or water drops from directly falling on the lip portion, thereby preventing the cooling water from entering the inside of the bearing.

[Brief description of the drawings]

FIG. 1 is a bearing seal device 10 according to a first embodiment.
0 is an axial section view.

FIG. 2 is a perspective view of a flinger 120.

FIG. 3 is a bearing seal device 20 according to a second embodiment.
0 is an axial section view.

FIG. 4 is an axial sectional view of a water pump used in a water-cooled internal combustion engine.

FIG. 5 is an axial sectional view of a bearing sealing device 400 according to the prior art.

[Explanation of symbols]

 10 ‥‥ Outer ring 12 ‥‥ Rotary shaft 115 ‥‥ Seal member 120, 220 ‥‥ Flinger

Claims (1)

[Claims] 1. A seal member attached to one of an outer ring and an inner ring of a bearing and having a lip portion extending toward the other, and attached to the other ring to form a full circumference around the lip portion of the seal member. Wherein the annular member has an extending portion extending along the lip portion in a non-contact state with the lip portion, wherein the extending portion The bearing seal device for a water pump, wherein the lip portion is shielded from the outside by the above.